Commit 35605a10 authored by Yinghai Lu's avatar Yinghai Lu Committed by Ingo Molnar
Browse files

x86: enable PAT for amd k8 and fam10h 



make known_pat_cpu to think amd k8 and fam10h is ok too.

also make tom2 below to be WRBACK

Signed-off-by: default avatarYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 52783fa8

arch/x86/kernel/cpu/mtrr/generic.c

+17 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ static struct fixed_range_block fixed_range_blocks[] = { 
static unsigned long smp_changes_mask;

static struct mtrr_state mtrr_state = {};

static int mtrr_state_set;

static u64 tom2;



#undef MODULE_PARAM_PREFIX

#define MODULE_PARAM_PREFIX "mtrr."
@@ -138,6 +139,11 @@ u8 mtrr_type_lookup(u64 start, u64 end) 
		}

	}



	if (tom2) {

		if (start >= (1ULL<<32) && (end < tom2))

			return MTRR_TYPE_WRBACK;

	}



	if (prev_match != 0xFF)

		return prev_match;
@@ -206,6 +212,15 @@ void __init get_mtrr_state(void) 
	mtrr_state.def_type = (lo & 0xff);

	mtrr_state.enabled = (lo & 0xc00) >> 10;



	if (amd_special_default_mtrr()) {

		unsigned lo, hi;

		/* TOP_MEM2 */

		rdmsr(MSR_K8_TOP_MEM2, lo, hi);

		tom2 = hi;

		tom2 <<= 32;

		tom2 |= lo;

		tom2 &= 0xffffff8000000ULL;

	}

	if (mtrr_show) {

		int high_width;
@@ -236,6 +251,8 @@ void __init get_mtrr_state(void) 
			else

				printk(KERN_INFO "MTRR %u disabled\n", i);

		}

		if (tom2)

			printk(KERN_INFO "TOM2: %016lx aka %ldM\n", tom2, tom2>>20);

	}

	mtrr_state_set = 1;

arch/x86/kernel/cpu/mtrr/main.c

+1 −1
Original line number Diff line number Diff line
@@ -627,7 +627,7 @@ early_param("disable_mtrr_trim", disable_mtrr_trim_setup); 
#define Tom2Enabled (1U << 21)

#define Tom2ForceMemTypeWB (1U << 22)



static __init int amd_special_default_mtrr(void)

int __init amd_special_default_mtrr(void)

{

	u32 l, h;

arch/x86/mm/pat.c

+6 −0
Original line number Diff line number Diff line
@@ -47,6 +47,12 @@ static int pat_known_cpu(void) 
			return 1;

		}

	}

	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&

	     boot_cpu_data.x86 >= 0xf && boot_cpu_data.x86 <= 0x11) {

		if (cpu_has_pat) {

			return 1;

		}

	}



	pat_wc_enabled = 0;

	printk(KERN_INFO "CPU and/or kernel does not support PAT.\n");

include/asm-x86/mtrr.h

+1 −0
Original line number Diff line number Diff line
@@ -99,6 +99,7 @@ extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi); 
extern void mtrr_ap_init(void);

extern void mtrr_bp_init(void);

extern int mtrr_trim_uncached_memory(unsigned long end_pfn);

extern int amd_special_default_mtrr(void);

#  else

static inline u8 mtrr_type_lookup(u64 addr, u64 end)

{